| Canonical Name: | IGR J18490-0000 |
| TeVCat Name: | TeV J1849-000 |
| Other Names: | HESS J1849-000
3C391
2HWC J1849+001
eHWC J1850+001
1LHAASO J1848-0001u |
| Source Type: | PWN |
| R.A.: | 18 48 56 (hh mm ss) |
| Dec.: | -00 02 28 (dd mm ss) |
| Gal Long: | 32.61 (deg) |
| Gal Lat: | 0.54 (deg) |
| Distance: | 7 kpc |
| Flux: | 0.015 (Crab Units) |
| Energy Threshold: | 350 GeV |
| Spectral Index: | |
| Extended: | Yes |
| Size (X): | 0.00 (deg) |
| Size (Y): | 0.00 (deg) |
| Discovery Date: | 2008-07 |
| Discovered By: | H.E.S.S. |
| TeVCat SubCat: | Default Catalog |
Source Notes:
| H.E.S.S. Galactic Plane Survey (HGPS, 2018): |
| A selection of information for each of the 78 sources in the HGPS is provided in TeVCat. For full details, visit the HGPS website. |
| Name: | HESS J1849-000 |
| Source Class: | PWN |
| Identified Object: | PSR J1849-0001 |
| R.A. (J2000): | 282.24 deg (18 48 56) |
| Dec. (J2000): | -0.04 deg (-00 02 28) |
| Positional uncertainty: | 0.040 deg |
| Spatial Model: | Gaussian |
| Size: | 0.090 +/- 0.015 deg |
| Spectral Model: | power law |
| Integral Flux > 1 TeV: | 5.75e-13 +/- 7.15e-14 cm-2 s-1 |
| Pivot Energy, E0: | 2.74 TeV |
| Diff. Flux at E0: | 7.66e-14 +/- 9.52e-15 cm-2 s-1 TeV-1 |
| Spectral Index: | 1.97 +/- 0.09 |
| HGPS Source Notes: | |
| | |
The following is the text from the HGPS paper:
The faint, slightly extended source HESS J1849-000 was first reported by
Terrier et al. (2008). It was found to be spatially
coincident with the hard X-ray source IGR J18490-0000
(Krivonos et al. 2012). XMM-Newton observations revealed a nonthermal, point-like,
X-ray source surrounded by a nebula, making this object a solid PWN candidate. Follow-up observations of the hard X-ray source with RXTE have confirmed this hypothesis with the discovery of a 38.5 ms periodicity of the X-ray signal
(Gotthelf et al. 2011). The associated
pulsar, PSR J1849-0001, was found to have a spin-down luminosity Edot of 9.8 × 10e36 erg s-1 and a characteristic age Tchar of 42.9 kyr.
The HGPS analysis confirms the existence of a source coincident with PSR J1849-0001. The best-fit position of HESS J1849-000 is located
less than 0.03 deg from the X-ray pulsar position, well within statistical uncertainties in both source localizations. The best-fit size of the VHE emission is 0.09 deg, which
is about a factor of two larger than that of the extended X-ray component
(Gotthelf et al. 2011; Kuiper & Hermsen 2015).
The source has an energy flux approximately 2.1×10e-12 erg cm-2 s-1, in the range 1-10 TeV, a factor of approximately 2 above the X-ray nebula energy flux in the range 2–10 keV
(Kuiper & Hermsen 2015). This confirms the likely
nature of HESS J1849-000 as a PWN in transition between a young, synchrotron-dominated phase and an evolved, IC-dominated phase.
This is one of the 31 firmly-identified objects among the HGPS sources. Two possible associations are listed in Table A.9. "This is a
list of astronomical objects, extracted from catalogs of plausible counterparts, which are are found to be spatially coincident with the HGPS source":
- G32.6+0.5 (PWN)
- J1849-0001 (PSR)
Source position and its uncertainty:
On 200323 the source position was updated from that given in
Terrier et al. (2008) to that
given in
H.E.S.S. Collaboration (2018).
From
H.E.S.S. Collaboration (2018):
- R.A. (J2000): 18h 48m 56s
- Dec. (J2000): -00d 02' 28''
- Positional uncertainty: 0.040 deg
From
Terrier et al. (2008):
- the position error is consistent with the X-ray source - XMM Position given as:
R.A. (J2000): 18h 49m 01.63s
Dec. (J2000): -00d 01' 17.2"
Source Association:
From
Cao et al. (2021):
- IGR J18490-0000 / HESS J1849-000 / 2HWC J1849+001 may be associated with
LHAASO J1849-0003
From
Vleeschower Calas et al. (2018):
The authors present the results of an XMM-Newton observation on
PSR J1849-001. They studied the X-ray emission in detail:
- "we found extended emission (up to ~100 arcsec) from the Pulsar Wind
Nebula (PWN), confirming that this is a case of a Pulsar/PWN system
and strengthening the evidence that X-ray, hard X-ray and TeV
gamma-ray sources are manifestations of the same system."
- "Another important result of our study is the clear evidence that
the X-ray PWN of PSR J1849-0001 is asymmetric."
From
Abeysekara et al. (2017):
- "Source 2HWC J1849+001 is associated with the extended TeV source
HESS J1849-000 (approx. 0.2deg distance) (
Terrier et al. 2008), which
is coincident with the INTEGRAL source IGR J18490-0000. Further X-ray
observations by XMM-Newton and RXTE revealed that IGR J18490-0000 is a
Pulsar/PWN system, where a young and very energetic pulsar (E-dot of
9.8 x10e36 erg s-1, age = 43 kyr, distance unknown) is powering the
system, and a compact PWN is detected in the X-ray observations
(
Gotthelf et al. 2011)."
From
ATel 3057 (2010) and
Gotthelf et al. (2010):
- these report the detection of pulsations from
PSR J1849-0001 at an assumed distance of 7 kpc. If this pulsar is associated
with the TeV emission this puts this emission at 0.13% of the spin-down
luminosity of PSR J1849-0001, similar to other middle-aged pulsars
From
Mandelartz & Becker Tjus (2013):
- it is implied that this source is related to
3C391, which lies close
to the location of the XMM source (0.54 arcsec)
Special Notes:
From
Terrier et al. (2008):
- "Details of the TeV source extension and spectral
properties will be given in a forthcoming publication."
Source Extent:
From
Terrier et al. (2008):
- there is "an indication of extension"
- no information on the size of the extent is provided
Significance (provided here for sources Newly Announced Catalog):
From
Terrier et al. (2008):
- 7.8 sigma (pre trial)
Emission above 56 GeV:
From
HAWC Collaboration (2019):
- This source overlaps with eHWC J1850+001 one of nine sources in the
first catalog of gamma-ray sources emitting above 56 TeV presented by
the HAWC Collaboration
- The properties given in the eHWC catalog are the following:
... Source name: eHWC J1850+001
... R.A. (deg): 282.59 +/- 0.21
... Dec. (deg): 0.14 +/- 0.12
... Extension > 56 TeV (deg): 0.37 +/- 0.16
... F (10e-14 ph cm-2 s-1): 1.1+0.3-0.2
... sqrt(TS) > 56 TeV: 5.31
... Nearest 2HWC source: J1849+001
... Distance to 2HWC source (deg): 0.20
... sqrt(TS) > 100 TeV: 3.04
A PeVatron:
From
Cao et al. (2024):
- This source is listed as being a UHE source in Table 2. This means
that it has a detection above 100 TeV at a significance level
corresponding to a test statistic of greater than 20.
Seen by: H.E.S.S., HAWC, LHAASO
-
The First LHAASO Catalog of Gamma-Ray Sources
Cao, Zhen et al., ApJS 271 p25 (2024) [LINK]
-
Ultrahigh-energy photons up to 1.4 petaelectronvolts from 12 gamma-ray Galactic sources
Cao, Z., Aharonian, F.A., An, Q., et al., Nature 594 p33-36 (2021) [LINK]
-
The Hunt for Pevatrons: The Case of Supernova Remnants
Cristofari, P., arXiv e-prints parXiv:2110.07956 (2021) [LINK]
-
Multiple Galactic Sources with Emission Above 56 TeV Detected by HAWC
HAWC Collaboration et al., arXiv e-prints parXiv:1909.08609 (2019) [LINK]
-
Studies of high-energy pulsars: The special case of PSR J1849-0001
Vleeschower Calas, L. et al., ArXiv e-prints p (2018) [LINK]
-
Ancient Pulsar Wind Nebulae as a natural explanation for unidentified gamma-ray sources
Kaufmann, S. and Tibolla, O., ArXiv e-prints p (2018) [LINK]
-
The H.E.S.S. Galactic plane survey
H.E.S.S. Collaboration et al., A&A 612 pA1 (2018) [LINK]
-
A statistical study of Galactic SNR source spectra detected at >GeV energies
Mandelartz, M. and Becker Tjus, J., ArXiv e-prints p (2013) [LINK]
-
Discovery of a pulsar wind nebula associated with IGR J18490-0000
Terrier, R. et al., Proc. 4th Int. Meeting on High Energy Gamma-Ray Astronomy, AIP 1085 p312-315 (2008) [LINK]
-
Discovery of PSR J1849-0001, a 38.5 ms Pulsar Powering IGR J18490-0000/HESS J1849-000
Gotthelf, E.V. et al., ATel 3057 [LINK]
Want a reference added? Send a bibtex entry to
the TeVCat Team
